Buggy code:
public class ElementGwtTest { GuitDom f = new GuitDomMock ( ) ; @ Test public void testBody ( ) { } @ Test public void complexSelector ( ) { } @ Test ( expected = RuntimeException . class ) public void childrenException ( ) { } @ Test public void test ( ) { Element e = new ElementMock ( "input" ) ; assertTrue ( e . hasTagName ( "input" ) ) ; assertFalse ( e . hasTagName ( "label" ) ) ; assertEquals ( "input" , e . tag ( ) ) ; assertEquals ( 0 , e . children ( ) . size ( ) ) ; String attrName = "name" ; String attrValue = "firstName" ; e . attr ( attrName , attrValue ) ; assertEquals ( attrValue , e . attr ( attrName ) ) ; assertTrue ( e . hasAttribute ( attrName ) ) ; e . removeAttr ( attrName ) ; assertFalse ( e . hasAttribute ( attrName ) ) ; <START_BUG> String styleProp = "background-color" ; <END_BUG> String styleValue = "red" ; e . css ( styleProp , styleValue ) ; assertEquals ( styleValue , e . css ( styleProp ) ) ; styleProp = "color" ; styleValue = "red" ; e . css ( styleProp , styleValue ) ; assertEquals ( styleValue , e . css ( styleProp ) ) ; styleValue = "black" ; e . css ( styleProp , styleValue ) ; assertEquals ( styleValue , e . css ( styleProp ) ) ; assertTrue ( e . css ( "border" ) . isEmpty ( ) ) ; e . attr ( "style" , ";color:red;;" ) ; assertEquals ( "red" , e . css ( "color" ) ) ; String childrenAttrValue = "nameLabel" ; String labelText = "First<seq2seq4repair_space>name:" ; String inputText = "<span>Insert<seq2seq4repair_space>your<seq2seq4repair_space>first<seq2seq4repair_space><span>name<//span><//span>" ; String html = ( ( ( ( ( ( ( ( ( ( ( ( "<label<seq2seq4repair_space>" + attrName ) + "=\"" ) + childrenAttrValue ) + "\">" ) + labelText ) + "<//label>" ) + "<input<seq2seq4repair_space>" ) + attrName ) + "=\"" ) + attrValue ) + "\">" ) + inputText ) + "<//input>" ; e . html ( html ) ; assertEquals ( html , e . html ( ) ) ; List < Element > elementsByTagName = e . elementsByTagName ( "span" ) ; assertEquals ( 2 , elementsByTagName . size ( ) ) ; e . first ( ) ; e . last ( ) ; List < Element > children = e . children ( ) ; assertEquals ( 2 , children . size ( ) ) ; Element labelChild = children . get ( 0 ) ; assertEquals ( e , labelChild . parent ( ) ) ; assertEquals ( "label" , labelChild . tag ( ) ) ; assertEquals ( labelText , labelChild . html ( ) ) ; assertEquals ( childrenAttrValue , labelChild . attr ( attrName ) ) ; Element inputChild = children . get ( 1 ) ; assertEquals ( inputText , inputChild . html ( ) ) ; assertEquals ( "input" , inputChild . tag ( ) ) ; assertEquals ( attrValue , inputChild . attr ( attrName ) ) ; List < Element > selected = e . query ( "label" ) ; assertEquals ( 1 , selected . size ( ) ) ; } @ Test ( expected = RuntimeException . class ) public void queryException ( ) { } @ Test public void emptyQuery ( ) { } private boolean value = false ; @ Test public void callers ( ) { } @ Test public void testTable ( ) { } @ Test public void className ( ) { } @ Test public void properties ( ) { } @ Test public void nextSibling ( ) { } @ Test public void styleWithoutValue ( ) { } @ Test public void addChild ( ) { } @ Test public void addInsert ( ) { } }

Fix:
String styleProp = "backgroundColor" ;